I think this is the wrong read on the “threat”. One user going out of their way to spent time writing this post is a canary in the coal mine. Most users never give feedback, they just churn. This is the same reason your toothpaste has a phone number on the back - that one random person who cares deeply calls the number and provides invaluable feedback on the product.
It’s not about the one person, it’s about that person representing tens/hundreds/thousands of customers. This feedback is a gift to a product manager that listens.